There's a lot of WWII documentaries, as well as a lot of text written. Moreover, WWII history is a part of the school program in basically all European countries. Well, I was born in USSR and may say that the WWII was a nation-building historical event as well as Civil War and following South Reconstruction. I.e
. these events have been established a kind of baselines for these nations to become communities that every member can realize.
Anyway, this film is a masterpiece of something other than a documentary or historical movie. This movie gives us an example of symbols and ideas that US soldiers share (well, even if denying) This gave US soldiers a shared vision of ongoing events, their reasons and consequences. Well, the propaganda as it is always provide you more comparisons than facts, but we'll underestimate people if suppose that they will follow propaganda (as well as commercials) comparisons. But the baseline of facts and links between them is something nobody could deny if that corresponds his own observations.
That's why war propaganda materials are the best if you want to understand people motivation. We are looking on history from the perspective, we can see consequences of 1945 for events taken place in 1939, but people lived in 1939 and even in 1944 could not know these. And the ultimate tool for understanding their actions, decisions, hopes and fears is studying these propaganda movies